Ok so this one was a long journey but a very satisfying one in the end. A young man showed up at the shop in the summer of 2017 asking about a big block build based on a 400 he had--said he had found me through some of the EMC magazine articles and wanted a pretty serious street engine for his 4 spd Belvedere? Polara? We set out a plan to build a 470 with a steel anvil reliable solid flat tappet camshaft and all the other street use dictated compromises. Pumpgas, decent stable idle, single 4 carb, and some decent RPM capability.....
At the time I was commissioned to machine the block and spec out a custom camshaft. So I line honed , decked, bored/honed, 1/2" Hemi p-u, oiling mods, installed coated cam bearings etc.... He ordered a 440 source 470 kit in the meantime. Sometime later he committed to using the TF 240's and the static compression came in a little too high with the Icon flat tops so I CNC'd a conical dish to gain a measured 4cc's for a final comp ratio of 10.78. The cam took me about a week of mulling over and is maybe a little unconventional.
Cam is 251/250 .593/.585 <1.6 113 LSA .020"/.016" lobe lift can be back calculated but the lobes are not all that aggressive in the name of longevity.
Fast forward to summer of 2021 and the customer now has the TF 240's and I offer to flow test them for my knowledge and I believe I posted here the flow numbers I recorded. They flowed pretty much what TF advertised which puts TF very high in integrity in my books.
Long story longer...The customer and his father assemble the engine and brought it to me for cam breakin and dyno--Yes outer springs only and I installed the innersprings after a successful fire up and automated breakin cycle. Here is a picture--Any guesses as to dyno results? Oh and the customers goal was 600hp with a civil idle and low speed driveability as he lives in a big city and sees a lot of stop and go traffic with some RPM as he wants to fool around with some of the high end exotics that are often on the highways in and around the big cities. I'll admit that I consider 600hp out of this kind of unlikely when you really see the sum of the parts. J.Rob
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